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‎.all-contributorsrc‎

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‎README.md‎

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<!-- the line below needs to be an empty line C: (its because kramdown isnt
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<!-- the line below needs to be an empty line C: (its because kramdown isn't
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that smart and dearly wants an empty line before a heading to be able to
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display it as such, e.g. website) -->
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[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
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[![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
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[![All Contributors](https://img.shields.io/badge/all_contributors-289-orange.svg?style=flat-square)](#contributors-)
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[![All Contributors](https://img.shields.io/badge/all_contributors-309-orange.svg?style=flat-square)](#contributors-)
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<!-- ALL-CONTRIBUTORS-BADGE:END -->
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<br/>
@@ -448,6 +448,31 @@ This project is licensed under the terms of the MIT license.
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/sanchitbansal10"><img src="https://avatars.githubusercontent.com/u/16536741?v=4?s=100" width="100px;" alt="Sanchit Bansal"/><br /><sub><b>Sanchit Bansal</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=sanchitbansal10" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/mm-saiful6854"><img src="https://avatars.githubusercontent.com/u/48361160?v=4?s=100" width="100px;" alt="Md Saiful Islam"/><br /><sub><b>Md Saiful Islam</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mm-saiful6854" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/AddeusExMachina"><img src="https://avatars.githubusercontent.com/u/39912670?v=4?s=100" width="100px;" alt="Antonio Addeo"/><br /><sub><b>Antonio Addeo</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=AddeusExMachina" title="Documentation">📖</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=AddeusExMachina" title="Code">💻</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/Upendra-Allagadda"><img src="https://avatars.githubusercontent.com/u/25962010?v=4?s=100" width="100px;" alt="Allagadda Sai Upendranath"/><br /><sub><b>Allagadda Sai Upendranath</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Upendra-Allagadda" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/mobraga/"><img src="https://avatars.githubusercontent.com/u/31048764?v=4?s=100" width="100px;" alt="Matheus Braga"/><br /><sub><b>Matheus Braga</b></sub></a><br /><a href="#translation-mathbraga" title="Translation">🌍</a> <a href="https://github.com/iluwatar/java-design-patterns/commits?author=mathbraga" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/satyabarghav"><img src="https://avatars.githubusercontent.com/u/36763910?v=4?s=100" width="100px;" alt="Appari Satya Barghav"/><br /><sub><b>Appari Satya Barghav</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=satyabarghav" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="http://mribeirodantas.me"><img src="https://avatars.githubusercontent.com/u/1023197?v=4?s=100" width="100px;" alt="Marcel Ribeiro-Dantas"/><br /><sub><b>Marcel Ribeiro-Dantas</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=mribeirodantas" title="Documentation">📖</a></td>
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</tr>
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<tr>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/hamexhanif"><img src="https://avatars.githubusercontent.com/u/74542852?v=4?s=100" width="100px;" alt="Muhammad Hanif Amrullah"/><br /><sub><b>Muhammad Hanif Amrullah</b></sub></a><br /><a href="#translation-hamexhanif" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/JackH408"><img src="https://avatars.githubusercontent.com/u/141727294?v=4?s=100" width="100px;" alt="JackH408"/><br /><sub><b>JackH408</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=JackH408" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/versus2004"><img src="https://avatars.githubusercontent.com/u/132815243?v=4?s=100" width="100px;" alt="Shubham"/><br /><sub><b>Shubham</b></sub></a><br /><a href="#translation-versus2004" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/inishantjain"><img src="https://avatars.githubusercontent.com/u/121454072?v=4?s=100" width="100px;" alt="Nishant Jain"/><br /><sub><b>Nishant Jain</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=inishantjain" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/hallowshaw"><img src="https://avatars.githubusercontent.com/u/90751158?v=4?s=100" width="100px;" alt="Rhitam Chaudhury"/><br /><sub><b>Rhitam Chaudhury</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=hallowshaw" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/JerryZhao275"><img src="https://avatars.githubusercontent.com/u/132061401?v=4?s=100" width="100px;" alt="JerryZhao275"/><br /><sub><b>JerryZhao275</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=JerryZhao275" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://twitter.com/llisant"><img src="https://avatars.githubusercontent.com/u/1445890?v=4?s=100" width="100px;" alt="Leonardo Lisanti"/><br /><sub><b>Leonardo Lisanti</b></sub></a><br /><a href="#translation-leonardol" title="Translation">🌍</a></td>
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</tr>
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<tr>
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<td align="center" valign="top" width="14.28%"><a href="http://www.linkedin.com/in/yenniferh"><img src="https://avatars.githubusercontent.com/u/19285706?v=4?s=100" width="100px;" alt="Yennifer Herrera"/><br /><sub><b>Yennifer Herrera</b></sub></a><br /><a href="#translation-Yenniferh" title="Translation">🌍</a> <a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3AYenniferh" title="Reviewed Pull Requests">👀</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/jnniu-n"><img src="https://avatars.githubusercontent.com/u/141746282?v=4?s=100" width="100px;" alt="jnniu-n"/><br /><sub><b>jnniu-n</b></sub></a><br /><a href="#translation-jnniu-n" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/miguel-is-coding"><img src="https://avatars.githubusercontent.com/u/48435117?v=4?s=100" width="100px;" alt="Miguel Angel Perez Garcia"/><br /><sub><b>Miguel Angel Perez Garcia</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/pulls?q=is%3Apr+reviewed-by%3Amiguel-is-coding" title="Reviewed Pull Requests">👀</a> <a href="#translation-miguel-is-coding" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/SuwanSankaja"><img src="https://avatars.githubusercontent.com/u/86839778?v=4?s=100" width="100px;" alt="Suwan Sankaja"/><br /><sub><b>Suwan Sankaja</b></sub></a><br /><a href="#translation-SuwanSankaja" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/Iamalok007"><img src="https://avatars.githubusercontent.com/u/97467835?v=4?s=100" width="100px;" alt="alok"/><br /><sub><b>alok</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Iamalok007" title="Documentation">📖</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/dlvideira"><img src="https://avatars.githubusercontent.com/u/53951425?v=4?s=100" width="100px;" alt="Daniel Lisboa"/><br /><sub><b>Daniel Lisboa</b></sub></a><br /><a href="#translation-dlvideira" title="Translation">🌍</a></td>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/ComplexOW"><img src="https://avatars.githubusercontent.com/u/105279107?v=4?s=100" width="100px;" alt="Sam Powell"/><br /><sub><b>Sam Powell</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=ComplexOW" title="Documentation">📖</a></td>
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</tr>
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<tr>
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<td align="center" valign="top" width="14.28%"><a href="https://github.com/jppf22"><img src="https://avatars.githubusercontent.com/u/104360594?v=4?s=100" width="100px;" alt="João Fernandes"/><br /><sub><b>João Fernandes</b></sub></a><br /><a href="#translation-jppf22" title="Translation">🌍</a></td>
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</tr>
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</tbody>
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</table>

‎adapter/README.md‎

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* [Dzone](https://dzone.com/articles/adapter-design-pattern-in-java)
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* [Refactoring Guru](https://refactoring.guru/design-patterns/adapter/java/example)
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* [Baeldung](https://www.baeldung.com/java-adapter-pattern)
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* [GeeksforGeeks](https://www.geeksforgeeks.org/adapter-pattern/)
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## Consequences
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Class and object adapters have different trade-offs. A class adapter

‎adapter/pom.xml‎

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This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
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The MIT License
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Copyright © 2014-2022 Ilkka Seppälä
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Copyright © 2014-2023 Ilkka Seppälä
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal

‎aggregator-microservices/information-microservice/src/main/java/com/iluwatar/information/microservice/InformationController.java‎

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‎caching/src/main/java/com/iluwatar/caching/database/DbManagerFactory.java‎

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‎circuit-breaker/src/main/java/com/iluwatar/circuitbreaker/App.java‎

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‎circuit-breaker/src/test/java/com/iluwatar/circuitbreaker/DefaultCircuitBreakerTest.java‎

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‎commander/README.md‎

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## Explanation
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Handling distributed transactions can be tricky, but if we choose to not handle it carefully, there could be unwanted consequences. Say, we have an e-commerce website which has a Payment microservice and a Shipping microservice. If the shipping is available currently but payment service is not up, or vice versa, how would we deal with it after having already received the order from the user?
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We need a mechanism in place which can handle these kinds of situations. We have to direct the order to either one of the services (in this example, shipping) and then add the order into the database of the other service (in this example, payment), since two databses cannot be updated atomically. If currently unable to do it, there should be a queue where this request can be queued, and there has to be a mechanism which allows for a failure in the queueing as well. All this needs to be done by constant retries while ensuring idempotence (even if the request is made several times, the change should only be applied once) by a commander class, to reach a state of eventual consistency.
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We need a mechanism in place which can handle these kinds of situations. We have to direct the order to either one of the services (in this example, shipping) and then add the order into the database of the other service (in this example, payment), since two databases cannot be updated atomically. If currently unable to do it, there should be a queue where this request can be queued, and there has to be a mechanism which allows for a failure in the queueing as well. All this needs to be done by constant retries while ensuring idempotence (even if the request is made several times, the change should only be applied once) by a commander class, to reach a state of eventual consistency.
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## Credits
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‎crtp/README.md‎

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## Credits
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* [How do I decrypt "Enum<E extends Enum<E>>"?](http://www.angelikalanger.com/GenericsFAQ/FAQSections/TypeParameters.html#FAQ106)
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* [How do I decrypt "Enum<E extends Enum\<E>>"?](http://www.angelikalanger.com/GenericsFAQ/FAQSections/TypeParameters.html#FAQ106)
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* Chapter 5 Generics, Item 30 in [Effective Java](https://www.amazon.com/gp/product/0134685997/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0134685997&linkCode=as2&tag=javadesignpat-20&linkId=4e349f4b3ff8c50123f8147c828e53eb)

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